198
WWUS76 KLOX 180846
NPWLOX
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
146 AM PDT TUE AUG 18 2026
CAZ038-088-343>345-351-353-371>373-375-376-379-380-548-182100-
/O.CON.KLOX.HT.Y.0013.260818T1700Z-260821T0300Z/
CUYAMA VALLEY-SANTA CLARITA VALLEY-SOUTHERN SALINAS VALLEY-SAN
LUIS OBISPO COUNTY INTERIOR VALLEYS-SAN LUIS OBISPO COUNTY
MOUNTAINS-SANTA YNEZ MOUNTAINS WESTERN RANGE-SANTA BARBARA COUNTY
INTERIOR MOUNTAINS-CALABASAS AND AGOURA HILLS-WESTERN SAN
FERNANDO VALLEY-EASTERN SAN FERNANDO VALLEY-SANTA SUSANA
MOUNTAINS-SOUTHERN VENTURA COUNTY MOUNTAINS-WESTERN SAN GABRIEL
MOUNTAINS AND HIGHWAY 14 CORRIDOR-EASTERN SAN GABRIEL MOUNTAINS-
LOS ANGELES COUNTY SAN GABRIEL VALLEY-
INCLUDING THE CITIES OF SANTA CLARITA, SANTA MARGARITA LAKE,
NORTHRIDGE, CHATSWORTH, WARM SPRINGS, GLENDALE, OAT MOUNTAIN,
CALIENTE RANGE, MOUNT WILSON, ATASCADERO, NEW CUYAMA, LA PANZA RANGE,
PASO ROBLES, POMONA, ACTON, LA CANADA FLINTRIDGE, BIG PINE MOUNTAIN,
MILL CREEK, TEMPLETON, SAN GABRIEL, FIGUEROA MOUNTAIN, BURBANK,
WOODLAND HILLS, LAKE NACIMIENTO, SAN RAFAEL MOUNTAIN, UNIVERSAL CITY,
PASADENA, MATILIJA, THE ANGELES CREST HIGHWAY, LAKE CASTAIC, TOPATOPA
MOUNTAINS, EL MONTE, NEWHALL, CARRIZO PLAIN, SAN MIGUEL, WRIGHTWOOD,
SAN MARCOS PASS, VALENCIA, EAST LOS ANGELES, MALIBU LAKE, SUNLAND,
WESTLAKE VILLAGE, MOUNT BALDY, CRESTON, ROSE VALLEY, SHANDON, AND VAN
NUYS
146 AM PDT TUE AUG 18 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM
PDT THURSDAY...
* WHAT...HIGH TEMPERATURES OF 92 TO 105 EXPECTED, WITH MOST AREAS
SEEING PEAK HEAT ON WEDNESDAY AND THURSDAY. LOW TEMPERATURES ARE
EXPECTED TO RANGE FROM THE UPPER 60S TO LOWER 70S AT LOWER
ELEVATIONS TO THE MID 70S TO LOWER 80S IN THE FOOTHILLS AND
MOUNTAINS.
* WHERE...A PORTION OF SOUTHWEST CALIFORNIA.
* WHEN...FROM 10 AM THIS MORNING TO 8 PM PDT THURSDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES. WARMER THAN
NORMAL LOW TEMPERATURES WILL ADD TO THE HEAT DISCOMFORT.
* ADDITIONAL DETAILS...THE HEAT ADVISORY MAY NEED TO BE EXTENDED INTO
FRIDAY FOR PORTIONS OF THE FORECAST AREA, BUT THERE REMAINS
CONSIDERABLE UNCERTAINTY AT THIS TIME.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
TAKE EXTRA PRECAUTIONS WHEN OUTSIDE. WEAR LIGHTWEIGHT AND LOOSE
FITTING CLOTHING. TRY TO LIMIT STRENUOUS ACTIVITIES TO EARLY MORNING
OR EVENING. TAKE ACTION WHEN YOU SEE SYMPTOMS OF HEAT EXHAUSTION AND
HEAT STROKE.
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